rangemax? LXMG1611-01 p roduction d ata s heet not recommended for new design microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 1999 rev. 1.0b, 2006-11-10 www. microsemi . com digital dimming ccfl inverter module tm ? description rangemax? wide range dimming, single output inverter. the lxmg1611 series of direct drive ? ccfl (cold cathode fluorescent lamp) inverter modules are specifically designed for driving lcd backlight lamps. similar to the lxm1610, the lxmg1611 excels in applications where critical parameters incl ude very wide range dimmability, high efficiency and reliable fail-safe design in a small form factor. unlike the lxm1610 or any traditional dimming ccfl inverters, the lxmg1611 provides the designer a vastly superior display brightness range. 100:1+ brightness range is achievable with virtually any lcd display. our wide range dimming provides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light operating capability (i.e. "night readable"). the lxmg1611 is recommended for use in panels with low-voltage insulation on the lamp return wire. rangemax? digital dimming technique. digital dimming provides flicker free brightness control in any wide- range dimming appli cation. dimming ratios greater than 100:1 can be achieved. incorporation of a video synchronization feature allows wide ratio dimming without the display disturbances and interference seen with competitive products. the modules are equipped with a dimming input that permits brightness control from an external potentiometer or dc voltage source. the resultant "burst drive" that energizes the lamp was designed specifically to ensure that no premature lamp degradation occurs. (see "how rangemax? works" section) wide input voltage range. the modules convert unregulated dc voltage from the system battery or ac adapter directly to high frequency, high-voltage waves required to ignite and operate ccfl lamps. direct drive technology. the module design is based on a new direct drive topology, which provides a number of cost and performance advantages. the LXMG1611-01 series direct drive ? inverters eliminate the classic resonant inductor and capacitors, thus reducing cost and allowing a 30% reduction in module size. additional features. other benefits of this new topology are fixed-frequency operation and secondary-s ide strike-voltage regulation. strike-voltage re gulation minimizes corona discharge in the output transformer and related circuitry, providing longer life and higher reliabilit y. all lxmg1611 modules feature both open and shorted lamp protection. the lxmg1611 is full y customizable (electronically and mechanically) to specific customer requirements. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com protected by u.s. patents: 5,923, 129; 5,930,121; patents pending key features ? rangemax? wide range dimming ? 8v to 18v input voltage range ? 30% smaller than cs-zvs models ? easy to use brightness control ? microamp sleep mode ? output short-circuit protection and automatic strike-voltage regulation ? 7.3mm maximum module height, 16mm module width ? fixed frequency operation ? rohs compliant ? ul 60950 e175910 applications ? notebook and sub-notebook computers ? portable instrumentation ? desktop displays ? low ambient light conditions (i.e. aircraft cabins, automobile) benefits ? high efficiency and sleep mode feature extends computer battery life ? smooth, flicker free 1-100% full- range brightness control gives product a high quality image ? output open circuit voltage regulation minimizes corona discharge for long life and high reliability ? power efficient, ?low brightness? capability allows for advanced power manage ment product highlight rangemax? vs. analog dimming microsemi?s rangemax tm standard analog dimming inverter 0 30 45 60 75 90 105 1 2 3 4 5 power used (watts) light output (nits) ? rangemax? technology allows the designer to operate in a lower "brightness" and therefore at lower "power consumption" than can be r eached using traditional analog dimming inverters. ? dotted line indicates area where panel variations and parasitics will impact minimum light level with analog dimming. ? data presented for a rangemax? inverter driving a 13.3" lcd with a 1.2 nit to 120 nit brightness range. the minimum power levels were 0.4 watts (rangemax?) vs. 2.1 watts (analog dimming) for a power consumption savings of 1.7 watts. package order info LXMG1611-01 l l x x m m g g 1 1 6 6 1 1 1 1 - - 0 0 1 1
rangemax? LXMG1611-01 p roduction d ata s heet not recommended for new design microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 1999 rev. 1.0b, 2006-11-10 www. microsemi . com digital dimming ccfl inverter module tm ? absolute maximum ratings input supply vo ltage (v in)..................................................................................................... ................................................-0.3v to 18v output voltag e, no load ........................................................................................................ ......................internally li mited to 1800v rms output current ................................................................................................................. .............................10ma rms (internally limited) output power ................................................................................................................... ....................................................................... 6w input signal voltag e (brite input) ............................................................................................. ..........................................-0.3v to 6.5v input signal voltage ( sleep , v sync(-) , v sync(+) inputs) ........................................................................................................ -0.3 v to v in ambient operating temperature range ............................................................................................ ....................................... 0c to 70c storage temper ature ra nge ...................................................................................................... ...........................................-40c to +85c note: exceeding these ratings could cause dama ge to the device. all voltages are with respect to ground. currents are posit ive into, negative out of specified terminal . recommended operating conditions this module has been designed to operate over a wide range of input and output conditions. however, bet efficiency and perfor mance will be obtained if the module is operated under the condition liste d in the ?r.c.? column. min. and max. columns indicate values beyond which the inverter, although operational, will function optimally. LXMG1611-01 parameter symbol min r.c. max units input supply voltage range (functional) v in 8 12 18 v input supply voltage (fully regulated lamp current) 9 12 16 v output power p o 4 5 w brightness control input voltage range v brt adj 0 2.5 v lamp operating voltage v lamp 300 675 800 v rms lamp current (full brightness) i olamp 7 ma rms operating ambient temperature range t a 0 70 c electrical characteristics unless otherwise specified, these specifications apply over the recommended operating conditions and 25c ambient temperature f or the lxmg1611. LXMG1611-01 parameter symbol test conditions min typ max units ` output pin characteristics full bright lamp current i l(max) v brt adj = 2.5v dc , sleep = high, burst duty = 100%, v in = 9v dc 6.3 7.0 7.7 ma rms minimum lamp current (note 2) i l(min) v brt adj = 0v dc , sleep = high, burst duty = 2%, v in = 9v dc 0.14 ma rms lamp start voltage v ls 0c < t a < 40c, v in > 7v dc 1500 1800 v rms operating frequency f o v brt adj = 2.5v dc, sleep = high, vin = 12v dc 52 57 62 khz ` brite input input current i brt v brt adj = 0v dc -10 -12 -14 a dc input voltage for max. lamp current v c i o(lamp) = 100% duty cycle 2.5 2.6 v dc input voltage for min. lamp current v c i o(lamp) = minimum duty cycle 0 0 v dc ` sleep input run mode (hi) sleep v 2.2 v in v dc sleep mode (lo) sleep v -0.3 0.8 v dc input current sleep i sleep = 5v 120 180 a dc ` v sync(-) / v sync(+) characteristics logic high level v synch(hi) 4.0 6.5 v dc logic low level v synch(lo) -0.3 1.0 v dc input impedance z in 60 66 75 k ? pulse width (note 3) t pw 25 250 s input frequency f sync 49 150 hz ` power characteristics sleep current i in(min) v in = 15v dc , sleep < 0.8v 10 50 a dc note: 2. minimum lamp current required to maintain even light output may va ry with display panel. 3. the module will be functional with pulse widths much larger than 250s, but will have limited dimming. p p a a c c k k a a g g e e d d a a t t a a
rangemax? LXMG1611-01 p roduction d ata s heet not recommended for new design microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 1999 rev. 1.0b, 2006-11-10 www. microsemi . com digital dimming ccfl inverter module tm ? functional pin description conn. pin description cn1 cn1-1 cn1-2 v in input power supply (8v < v in < 18v). cn1-3 cn1-4 gnd power supply return. cn1-5 cn1-6 sleep on/off control. (2.2v < sleep < v in = on, -0.3v < sleep < 0.8v = off) cn1-7 v sync(-) vertical synchronization input, negative going cn1-8 v sync(+) vertical synchronization input, positive going 25s < t pw < 250s, 49hz < f sync < 150hz cn2 cn2-1 v hi high voltage connection to high side of lamp. connect to lamp with shortest lead length. do not connect to ground. cn2-2 v lo connection to low side of lamp. connect to lamp terminal with longer lead length. do not connect to ground. physical dimensions 3.85mm (0.15in.) 52.25mm (2.06in.) 60mm (2.36in.) 30mm (1.20in.) 100mm (3.93in.) cn2 7.3mm (0.287in.) 0.79mm (0.031in.) ? 2.95mm (0.116in.) grounded mounting hole 16mm (0.64in.) cn1 warning!! high voltage present all dimensions are in millimeters, inches are for reference only. connectors: recommended mate cn1 molex 53261-0871 pins: 50079-8100*, housing: 51021-0800 *loose (-8000, chain) recommended #26 awg wiring cn2 jst sm02(8.0)b-bhs-1-tb or yeon ho 20015wr-05a00 pins: 5bh-001t-p0.5, housing: bhr-03vs-1 b b l l o o c c k k d d i i a a g g r r a a m m
rangemax? LXMG1611-01 p roduction d ata s heet not recommended for new design microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 1999 rev. 1.0b, 2006-11-10 www. microsemi . com digital dimming ccfl inverter module tm ? how rangemax? works figure 1 ? 50% burst duty cycle figure 2 ? 2% burst duty cycle rather than using the traditional dimming technique of varying lamp current magnitude to adjust light output, rangemax? inverters use a fixed lamp current value with a duty cycle control method. the lamp current burst width can be modulated from 100% (continuous lamp current) down to a 2% duty cycle, allowing the lamp to be dimmed to less than 1% of its full brightness. as can be seen in trace 4 of figure 3 photo at right, careful design consideration was given to controlling lamp start voltage to softly start current flow. this eliminates current overshoot that can result in premature cathode wear and reduce lamp life. figure 3 ? 2% burst duty cycle (expanded time base) ramp gen transformer driver 0 - 2.5v dc + - lamp v lo v hi comparator ramp v brite v sync(-) high voltage transformer i sense v sense v sync(+) figure 4 ? rangemax? block diagram a a p p p p l l i i c c a a t t i i o o n n s s
rangemax? LXMG1611-01 p roduction d ata s heet not recommended for new design microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 1999 rev. 1.0b, 2006-11-10 www. microsemi . com digital dimming ccfl inverter module tm ? how rangemax? works (continued) ? on-board brightness control ci rcuit includes a dc voltage to pulse width converter that minimizes system design work and system noise susceptibility. this provides a familiar and convenient interface while reducing the potential for externally induced noise whic h can cause lamp flicker. ? an on-board oscillator operates the inverter burst rate above 95hz, well beyond standard 50/60hz video refresh rates where the eye can perceive pulsing light. ? rangemax inverter modules are designed to operate with the burst frequency synchronized to the video frame rate. this provides operation with no visible display disturbances caused by beat frequencies between the lamps and video frame rates. ? in applications with no acce ss to a vertical sync, the inverter burst frequency can be allowed to "free run" at 95hz. in this non-synchronous mode, minor display disturbances can be found under certain video conditions. this performance may be acceptable for many applications, but synchronization must be used when no disturbance can be tolerated. ? separate inputs are provided for negative and positive vertical sync pulses so external inversion is not needed. ? separate feedback loops for la mp current and open circuit voltage regulation insure reliable strike under all operating conditions, automatic over-voltage prevention with broken or failed lamps, and accurate lamp current regulation. typical applicaiton LXMG1611-01 v in brite sleep v sync(-) v sync(+) gnd v lo v hi 9-18v dc 10k 2.5v dc 5v 0v v sync(-) v sync(+) ccfl lamp figure 5 ? potentiometer brightness control 4.7f 4.99k* 4.99k brite LXMG1611-01 p.w. 100s pwm signal from system 0 p.w. 100% of period * use 4.99k for 5v pwm amplitude, 15k for 3.3v pwm amplitude, and omit for 2.5v pwm amplitude. figure 5a ? pwm brightness control ? the brightness control may be a simple 10k potentiometer or a voltage output dac. a pwm signal from a micro- controller may also be used with a suitable filter such as shown in figure 5a. ? if synchronization to the video framerate is desired, connect the vertical sync pu lse from the system video controller to the appropriate v sync input. if the pulse is negative going ( ), connect it to v sync(-) . if positive going ( ), connect it to v sync(+) . if no video synchronization is desired, leave both v sync(-) and v sync(+) floating. ? if you need to turn the inverter on/off remotely, connect a 3v or 5v logic signal to the sleep input. if remote on/off is not needed, connect the sleep input to v in or any other voltage greater than 2.2v dc . ? connect v hi to high voltage wire from the lamp. connect v lo to the low voltage wire (wire with thinner insulation). never connect v lo to circuit ground as this will defeat lamp current regulation. if both lamp wires have heavy high voltage insulation, connect the longest wire to v lo . rangemax? inverters also available in dual output lxmg1621-01 and quad output lxmg1643- 12-6x versions for multiple lamp applications. a a p p p p l l i i c c a a t t i i o o n n s s
rangemax? LXMG1611-01 p roduction d ata s heet not recommended for new design microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 1999 rev. 1.0b, 2006-11-10 www. microsemi . com digital dimming ccfl inverter module tm ? notes production data ? information contained in this document is proprietary to microsemi and is current as of publication date. this document may not be modified in any way without the express written consent of microsemi. product processing does not necessarily include testing of all parameters. microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. n n o o t t e e s s
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